NDLI: Experimental study of characteristics of micro-hole porous skins for turbulent skin friction reduction

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Experimental study of characteristics of micro-hole porous skins for turbulent skin friction reduction

Content Provider	NASA Technical Reports Server (NTRS)
Author	Hwang, Danny P.
Copyright Year	2002
Description	Characteristics of micro-hole porous skins for the turbulent skin friction reduction technology called the micro-blowing technique (MBT) were assessed experimentally at Mach 0.4 and blowing fractions from zero to 0.005. The objective of this study was to provide guidelines for the selection of porous plates for MBT. The hole angle, pattern, diameter, aspect ratio, and porosity were the parameters considered for this study. The additional effort to angle and stagger the holes was experimentally determined to be unwarranted in terms of skin friction benefit; therefore, these parameters were systematically eliminated from the parametric study. The impact of the remaining three parameters was evaluated by fixing two parameters at the reference values while varying the third parameter. The best hole-diameter Reynolds number was found to be around 400, with an optimum aspect ratio of about 6. The optimum porosity was not conclusively discerned because the range of porosities in the test plates considered was not great enough. However, the porosity was estimated to be about 15 percent or less.
File Size	1272390
Page Count	7
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20160001074
Archival Resource Key	ark:/13960/t0fv3ht2h
Language	English
Publisher Date	2002-09-08
Access Restriction	Open
Subject Keyword	Fluid Mechanics And Thermodynamics Aerodynamics Turbulence Hole Geometry Mechanics Skin Friction Calibrating Reynolds Number Blowing Aerodynamic Forces Flow Geometry Aspect Ratio Holes Mechanics Wind Tunnel Tests Flow Velocity Porosity Porous Plates Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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